Data Execution Prevention in Windows Live Messenger

"DEP prevents applications from running code from an unauthorized place in memory. There is Hardware enforced DEP and software enforced DEP. The DEP messenger has in place is basically exception handling which checks that the exception is code from within the program, and not malicious code elsewhere in memory. It is fine to disable this, it is not hackers trying to get into your computer.

Simply type this in command prompt to disable it and reboot:

bcdedit.exe /set {current} nx AlwaysOff"